I am looking for the most efficient way to copy data from one NSS volume
to another while preserving all metadata and especially Trustees. So
with OES11 SP2 and /ListXattrNWmetadata set I try the following as root:
# cp --preserve=all test1 test2
# rsync -X -A -av test1 test3
The first command will indeed copy the Trustee of file test1 as
explained in the NSS File System Administration Guide while the second
one does not. Is this a bug, or am I doing something stupid here?

/bin/cp from

/usr/bin/rsync from